Asked whether he was worried Rosberg would let his head drop, a confident Wolff said: "No, not at all. He is very focused.

"Following the race in China, when things did not go well for him all weekend, the thing he said afterwards was that it (his second place) was damage limitation.

"You have to remember a championship isn't won in one race, or two or three, it is won over 19 races.

"I guess they will continue to fight hard for the championship, so there is a strong possibility we will see more races like in Bahrain where they went wheel to wheel."

The first four races have seen Mercedes exert an unprecedented level of dominance at the start of a season because as well as claiming all four pole positions and race wins they have also led every lap.

Such authority may be threatened at the Circuit de Catalunya this weekend as the start of the European season generally sees teams add considerable upgrades to their cars to improve performance.

As to whether Red Bull or Ferrari have closed the gap to Mercedes with their packages remains to be seen.

Wolff, however, knows there can be no room for complacency, adding: "I believe this is an exceptional run we are on which you cannot take for granted.

"In a couple of years we will look back and say it was really great - winning four races in a row and claiming three doubles in a row.

"But we have to keep our feet on the ground and concentrate on developing the car further.

"You could see at the last race in China some of our competitors were strong in some of the stints, so we have to analyse why not the whole race.

"Fernando Alonso was strong in the first and second stint, as was Daniel Ricciardo, and also it was difficult to overtake.

"So if you get something wrong you can quickly end up in a situation where your comfortable lead is a lead no more.

"You don't want to be caught on the backfoot, so the kind of spirit we are trying to foster is that we do not have a comfortable lead."